EP0678021A1 - Procedes d'amelioration de la cognition au moyen d'antagonistes fonctionnels du complexe glycine/recepteur de nmda - Google Patents

Procedes d'amelioration de la cognition au moyen d'antagonistes fonctionnels du complexe glycine/recepteur de nmda

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Publication number
EP0678021A1
EP0678021A1 EP94906547A EP94906547A EP0678021A1 EP 0678021 A1 EP0678021 A1 EP 0678021A1 EP 94906547 A EP94906547 A EP 94906547A EP 94906547 A EP94906547 A EP 94906547A EP 0678021 A1 EP0678021 A1 EP 0678021A1
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European Patent Office
Prior art keywords
acid
pharmaceutically acceptable
salt
antagonist properties
functional antagonist
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German (de)
English (en)
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EP0678021B1 (fr
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Phil Skolnick
Ramon Trullas
Claudia P. Faiman
Eugenia Viu
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Consejo Superior de Investigaciones Cientificas CSIC
US Department of Health and Human Services
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Consejo Superior de Investigaciones Cientificas CSIC
US Department of Health and Human Services
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/185—Acids; Anhydrides, halides or salts thereof, e.g. sulfur acids, imidic, hydrazonic or hydroximic acids
    • A61K31/19—Carboxylic acids, e.g. valproic acid
    • A61K31/195—Carboxylic acids, e.g. valproic acid having an amino group
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
    • A61K31/47—Quinolines; Isoquinolines
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/08—Antiepileptics; Anticonvulsants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/28—Drugs for disorders of the nervous system for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00

Definitions

  • This invention relates to the field of neuropsychiatry and relates specifically to methods for memory enhancement and treatment of memory deficits consequent to neurological disorders.
  • NMDA N-methyl-D-aspartate
  • LTP long-term potentiation
  • the NMDA receptor also has been shown to be critically involved in various types of synaptic plasticity including enhanced synaptic transmission in the visual cortex; the kindling model of epilepsy; and vestibular compensation after unilateral labyrinthectomy.
  • the NMDA-sensitive glutamate receptor domain includes recognition sites (1) for the primary transmitter, with which agonists (e.g., NMDA and L-glutamate) and competitive antagonists (e.g., AP5 and PCP) interact; (2) a site through which glycine and drugs acting at the strychnine-insensitive glycine receptors bidirectionally modulate ion channel function; (3) a cation-binding site inside the channel; and (4) an inhibitory phencyclidine (PCP) site located within the receptor-operated cation channel.
  • the function of the NMDA receptor complex can be inhibited by drugs acting through several distinct mechanisms at the various recognition sites on the ligand-gated ion channel.
  • glycine potentiates the response to activation of NMDA receptors in cultured brain neurons. This is a strychnine-insensitive action and it is postulated to result from activation of a supraspinal glycine receptor which modulates the opening of the Na + - Ca ++ channel triggered by NMDA activation.
  • the structural requirements for ligand binding to the strychnine-insensitive glycine receptors and their regional distribution in the central nervous system, with a high density in the hippocampus, have been reported to differ remarkably from strychnine-sensitive glycine receptors.
  • Glycine agonists are believed to facilitate NMDA transmission and to have a positive effect on cognition in certain types of learning. For example, D-cycloserine, which exhibits a good affinity for the strychnine-insensitive glycine receptor, has been shown to facilitate acquisition of a hippocampal associated learning task and has been suggested to improve cognition.
  • PCP and MK-801 can affect certain types of memory and learning.
  • PCP and MK-801 have been shown to interfere with the ability of mice and rats to perform in a passive avoidance test.
  • other workers have demonstrated that PCP does not have a reliable effect on place learning.
  • the present invention provides methods for the improvement of cognitive function. More particularly, a method is provided wherein a patient receives, or is administered, a memory enhancing therapeutically effective dose or amount of a compound which possesses functional antagonist properties at the NMDA receptor complex through a specific action at the associated strychnine-insensitive glycine site.
  • the functional antagonist comprises a compound having the formula:
  • A is -C0 2 H, or a pharmaceutically acceptable ester, amide, or salt thereof
  • X is -NR 2 R 2 or a pharmaceutically acceptable acid addition salt thereof
  • R 1 and R 2 are independently selected from the group consisting of hydrogen and lower alkyl, optionally which can be substituted with halogen, hydroxyl, alkoxy, oxo, mercapto, aryl, or amino, or R 1 and R 2 together with the nitrogen to which they are attached form a substituted 5-membered or 6-membered heterocycle which also can contain another heteroatom such as oxygen, sulfur, or nitrogen.
  • the functional antagonist comprises 1-aminocyclopropanecarboxylic acid, or a pharmaceutically acceptable ester, amide, or salt thereof.
  • the functional antagonist comprises a compound having the formula:
  • the functional antagonist comprises 7- chlorokynurenic acid, or a pharmaceutically acceptable ester, amide, salt, ether, or acid addition salt thereof.
  • This invention also provides a method to treat a cognitive deficit consequent to a neurological disorder, whereby a therapeutically-effective amount of a compound which possesses functional antagonist properties at the NMDA receptor complex through a specific action at the associated strychnine- insensitive glycine site is administered to a patient.
  • the neurological disorder typically is the result of chronic neuronal degeneration or acute brain injury.
  • epilepsy or seizures
  • hypoxia either alone (e.g., carbon monoxide poisoning, near drowning) or combined with ischemic blood flow reduction (e.g., cardiac arrest, stroke)
  • anxiety e.g., affective disorders
  • neurodegenerative diseases e.g., Guam antilymphocyte serum (ALS) , Parkinson disease, Alzheimer disease, dementia and lathyrism
  • ALS Guam antilymphocyte serum
  • Parkinson disease Alzheimer disease
  • dementia dementia
  • Figure 1 is a graphical representation depicting the effects of glycinergic compounds and N-methyl- ⁇ -carboline-3- carboxamide (FG7142) on passive avoidance acquisition-retention 24 hours after training. All compounds were administered intraperitoneal (i.p.) 30 minutes before training. Training was performed with a 0.25 milliampere (mA) shock. Testing was 24 hours after training. Unfilled bars represent latency of non-shocked animals. Hatched bars represent latency 24 hours after training. The symbol "*" represents results that were significantly different from the saline group (p ⁇ 0.05 Mann- Whitney U-test) .
  • Figure 2 is a graphical representation depicting the ability of glycine to antagonize 1-aminocyclopropanecarboxylic acid induced facilitation of acquisition-retention.
  • Glycine (1 gram/kilogram (g/kg) ) was administered 75 minutes before training and ACPC (400 milligrams/kilogram (mg/kg) ) was administered 30 minutes before training. Training was performed with a 0.25 mA shock. Testing was 24 hours after training. Unfilled bars represent latency of non-shocked animals. Hatched bars represent latency 24 hours after training. The symbol •• *" represents results that were significantly different from the control group (p ⁇ 0.05 Mann- Whitney U-test) .
  • the ability of glycine to antagonize the effects of ACPC in this measure clearly demonstrates that ACPC acts as a functional antagonist through the strychnine- insensitive glycine receptor in the passive avoidance paradigm.
  • Figure 3 is a graphical representation showing the effects of ACPC and 7-chlorokynurenic acid (7KYN) on the passive avoidance retention deficit induced by pentylenetetrazol (PTZ) .
  • ACPC 400 mg/kg
  • 7KYN (30 mg/kg) were administered i.p. 30 minutes before training.
  • a convulsant dose of PTZ 45 mg/kg
  • PTZ 45 mg/kg
  • PTZ produced convulsions in all animals.
  • Unfilled bars represent latency of non-shocked animals. Hatched bars represent latency 24 hours after training.
  • the symbol "* n represents results that were significantly different from the control group (p ⁇ 0.05 Mann-Whitney U-test). These results show that, besides facilitating inhibitory avoidance acquisition-retention, ACPC and 7KYN protect against amnesia induced by PTZ. The protection afforded by ACPC was significantly better than that observed with 7KYN.
  • Figure 4 is a graphical representation depicting the effects of NMDA receptor complex ligands and diazepam (DZP) on passive avoidance acquisition-retention. All drugs were administered i.p. 30 minutes before training. Training was performed with a 0.625 mA shock. Testing was 24 hours later. Unfilled bars represent latency of non-shocked animals. Hatched bars represent latency 24 hours after training. The symbol "*" represents results that were significantly different from the control group (p ⁇ 0.05 Mann-Whitney U-test). These data demonstrate that in contrast to glycinergic compounds at the strychnine-insensitive receptor, other NMDA antagonists possess amnesic properties.
  • DZP diazepam
  • FIG. 5 is a graphical representation showing the effects of NMDA receptor complex ligands and FG7142 on retention of a passive avoidance task 30 minutes and 24 hours after training. All compounds were administered i.p. immediately after training. Training was with a 0.25 mA shock. Unfilled bars represent latency of non-shocked animals. Solid bars represent latency 30 minutes after training. Hatched bars represent latency 24 hours after training.
  • Figure 6 is a graphical representation showing the effects of ACPC and 7KYN on the passive avoidance acquisition- retention deficit induced by hypoxia.
  • ACPC 400 mg/kg
  • 7KYN (30 mg/kg) were administered i.p. immediately before hypoxia.
  • Hypoxia was induced by exposing the animals to a 7% oxygen environment for 30 minutes immediately before passive avoidance training. Training was performed with a 0.625 mA shock. Testing was 7 days later.
  • the filled bar represents latency of animals that were not submitted to hypoxia.
  • the unfilled bar represents latency of animals submitted to hypoxia with saline pretreatment. Hatched bars represent latency of animals submitted to hypoxia but receiving pre-treatment with ACPC (400 mg/kg) or 7KYN (30 mg/kg) .
  • “Improvement of cognitive function” embraces treatment to improve or enhance memory and/or treatment to address a cognitive deficit consequent to a neurological disorder.
  • Neurological disorder as utilized herein, unless otherwise qualified, means a disorder resulting from acute brain injury or chronic neuronal degeneration. More specifically, the following neurological disorders are included within the definition: epilepsy (or seizures) ; hypoxia, either alone (e.g., carbon monoxide poisoning, near drowning) or combined with ischemic blood flow reduction (e.g., cardiac arrest, stroke) ; anxiety; affective disorders; and neurodegenerative diseases (e.g., Guam ALS, Parkinson disease, Alzheimer disease, dementia and lathyrism) .
  • epilepsy or seizures
  • hypoxia either alone (e.g., carbon monoxide poisoning, near drowning) or combined with ischemic blood flow reduction (e.g., cardiac arrest, stroke)
  • anxiety affective disorders
  • neurodegenerative diseases e.g., Guam ALS, Parkinson disease, Alzheimer disease, dementia and lathyrism
  • “Functional antagonist at the strychnine-insensitive glycine receptor” refers to a compound that binds to the strychnine-insensitive glycine site of the NMDA receptor and has the functional consequence of reducing or antagonizing the effects of glutamate or NMDA effected through the NMDA receptor, as exemplified in, for example, a neurotoxicity assay (see Boje et al . (1992) Brain Research. "Desensitization of the NMDA receptor complex by glycinergic ligands in cerebellar granule cell cultures” (in press) , portions of which are reproduced below, and Patel et al . (1990) J. Neurochem. 54:849- 854) .
  • functional antagonists at the strychnine-insensitive glycine receptor refers to those compounds possessing functional antagonist properties at the NMDA receptor complex through a specinc action at the associated strychnine-insensitive glycine site.
  • Competitive antagonist refers to an antagonist that combines reversibly with the same binding sites of the receptor as the active drug and can be displaced from these sites by an excess of an agonist or antagonist with a greater binding affinity for the binding sites.
  • Noncompetitive antagonist refers to a substance that interacts at a distinct binding site and blocks the approach of an agonist to its binding site. Since they bind at distinct loci, noncompetitive antagonists are not displaced with increasing concentrations of agonist.
  • inhibitory avoidance task and “passive avoidance task” are equivalent and intended to refer to paradigms involving learning in response to aversive stimuli.
  • “Pharmaceutically acceptable ester” refers to those esters which retain, upon hydrolysis of the ester bond, the biological effectiveness and properties of the carboxylic acid or alcohol and are not biologically or otherwise undesirable.
  • esters are typically formed from the corresponding carboxylic acid and an alcohol.
  • ester formation can be accomplished via conventional synthetic techniques. (See, e .g. , March Advanced Organic Chemistry. 3rd Ed., John Wiley & Sons, New York (1985) p. 1157 and references cited therein, and Mark et al .
  • the alcohol component of the ester will generally comprise (i) a C 2 -C 22 aliphatic alcohol that can or can not contain one or more double bonds and can or can not contain branched carbon chains or (ii) a C 7 -C 12 aromatic or heteroaromatic alcohols.
  • This invention also contemplates the use of those compositions which are both esters as described herein and at the same time are the pharmaceutically acceptable acid addition salts thereof.
  • “Pharmaceutically acceptable amide” refers to those amides which retain, upon hydrolysis of the amide bond, the biological effectiveness and properties of the carboxylic acid or amine and are not biologically or otherwise undesirable.
  • amides as prodrugs, see Bundgaard, H., ed., (1985) Design of Prodrugs. Elsevier Science Publishers, Amsterdam. These amides are typically formed from the corresponding carboxylic acid and an amine. Generally, amide formation can be accomplished via conventional synthetic techniques. (See, e.g., March Advanced Organic Chemistry. 3rd Ed., John Wiley & Sons, New York (1985) p. 1152 and Mark et al . Encyclopedia of Chemical Technology. John Wiley & Sons, New York (1980).) This invention also contemplates the use of those compositions which are both amides as described herein and at the same time are the pharmaceutically acceptable acid addition salts thereof.
  • “Pharmaceutically acceptable ether” refers to those ethers which retain, upon hydrolysis of the ether bond, the biological effectiveness and properties of the hydroxyl containing compound and are not biologically or otherwise undesirable.
  • pharmaceutically acceptable ethers as prodrugs, see Bundgaard, H. , ⁇ upra .
  • ether formation can be accomplished via conventional synthetic techniques. (See, e.g., March Advanced Organic Chemistry. 3rd Ed., John Wiley & Sons, New York (1985) p.
  • ethers will typically be generated from 7-chlorokynurenic acid and a alkyl halide, an aryl halide, an arylalkyl halide, or a heteroaryl halide.
  • “Pharmaceutically acceptable salt” refers to those salts which retain the biological effectiveness and properties of the carboxylic acid and which are not biologically or otherwise undesirable, formed with alkali metal bases such as sodium or potassium; alkaline earth metal bases such as calcium; and with organic bases such as tromethamine, diethyla ine, ethanolamine, piperidine, isopropylamine, choline, caffeine, and the like.
  • alkali metal bases such as sodium or potassium
  • alkaline earth metal bases such as calcium
  • organic bases such as tromethamine, diethyla ine, ethanolamine, piperidine, isopropylamine, choline, caffeine, and the like.
  • “Pharmaceutically acceptable acid addition salt” refers to those salts which retain the biological effectiveness and properties of the free bases and which are not biologically or otherwise undesirable, formed with inorganic acids such as hydrochloric acid, hydrobro ic acid, sulfuric acid, nitric acid, phosphoric acid and the like, and organic acids such as acetic acid, propionic acid, glycolic acid, pyruvic acid, oxalic acid, malic acid, malonic acid, succinic acid, maleic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, cinnamic acid, mandelic acid, enthanesulfonic acid, ethanesulfonic acid, p-toluenesulfonic acid, salicylic acid and the like.
  • inorganic acids such as hydrochloric acid, hydrobro ic acid, sulfuric acid, nitric acid, phosphoric acid and the like
  • organic acids such as acetic acid, propionic acid, glycolic
  • Alkyl refers to a cyclic, branched, or straight chain alkyl group containing only carbon and hydrogen. This term is further exemplified by groups such as methyl, heptyl, -(CH 2 ) 2 -, and adamantyl.
  • Alkyl groups can either be unsubstituted or substituted with one or more non-interfering substituents, e.g., halogen, alkoxy, acyloxy, hydroxy, mercapto, carboxy, benzyloxy, phenyl, benzyl, or other functionality which has been suitably blocked with a protecting group so as to render the functionality non-interfering.
  • Each substituent can be optionally substituted with additional non- interfering substituents.
  • non-interfering characterizes the substituents as not adversely affecting any reactions to be performed in accordance with the process of this invention.
  • “Lower alkyl” refers to an alkyl group having one to nine carbon atoms, which can be straight or branched, including, for example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tertbutyl, amyl, hexyl, heptyl, octyl, nonyl, and the like.
  • Halogen refers to fluorine, chlorine, bromine, and iodine atoms.
  • Haldroxyl refers to -OH.
  • Alkoxy refers to the group alkyl-O-.
  • Mercapto refers to a -SH group.
  • Amino refers to -NH 2 .
  • Aryl or “Ar” refers to a monovalent aromatic carbocyclic group having a single ring (e.g., phenyl) or multiple condensed rings (e.g., naphthyl or anthryl) , which can optionally be unsubstituted or substituted with hydroxy, lower alkyl, alkoxy, chloro, halo, mercapto, and other non- interfering substituents.
  • Heterocycle refers to a monovalent saturated or aromatic carbocyclic group having a single ring (e.g., pyrrolidyl, pyridyl or furyl) or multiple condensed rings
  • Arylalkyl refers to the groups -R-Ar and
  • compositions of the instant invention refers to the amount of composition sufficient to induce a desired biological result. That result can be alleviation of the signs, symptoms, or causes of a disease, or any other desired alteration of a biological system. In the present invention, the result will involve the improvement or enhancement of memory or the treatment of a cognitive deficit linked to a neurological disorder.
  • “Pharmaceutically or therapeutically acceptable carrier” refers to a carrier medium which does not interfere with the effectiveness of the biological activity of the active ingredients and which is not toxic to the host or patient.
  • N-methyl-D-aspartate, NMDA N-methyl-D-aspartate, NMDA; 1-aminocyclopropanecarboxylic acid, ACPC; 7-chlorokynurenic acid or 7-chloro-4- hyd.troxyquinoline-2-carboxylic acid, 7KYN; 5,7-dichlorokynurenic acid, 5,7DKYN; diazepam, DZP;
  • the present invention provides for the administration of compounds which possess functional antagonist properties at the NMDA receptor complex through a specific action at the associated strychnine-insensitive glycine site to a patient to improve cognitive function.
  • functional antagonists include the competitive antagonist 7-chlorokynurenic acid (7KYN) and the partial agonist 1-aminocyclopropanecarboxylic acid (ACPC) .
  • 7KYN 7-chlorokynurenic acid
  • ACPC 1-aminocyclopropanecarboxylic acid
  • These functional antagonists block many of the biochemical and pharmacological actions of excess stimulation of the NMDA receptor complex. For example, these compounds reduce the neurotoxic effects of NMDA and/or glutamate that are mediated through the NMDA receptor complex. 7KYN has also been shown to block LTP. In addition, these two substances do not appear to share many of the undesirable side effects common to competitive NMDA antagonists and channel blockers.
  • Other functional antagonists can be identified through the procedure set forth in Boje
  • the compound which possesses functional antagonist properties at the NMDA receptor complex through a specific action at the associated strychnine-insensitive glycine site will comprise a compound having the formula:
  • A is -C0 2 H, or a pharmaceutically acceptable ester, amide, or salt thereof
  • X is -NR-'-R 2 or a pharmaceutically acceptable acid addition salt thereof
  • R 1 and R 2 are independently selected from the group consisting of hydrogen and lower alkyl, optionally substituted with halogen, hydroxyl, alkoxy, oxo, mercapto, aryl, or amino, or R 1 and R 2 together with the nitrogen to which they are attached form a substituted 5-membered or 6-membered heterocycle which can also contain another heteroatom such as oxygen, sulfur, or nitrogen.
  • the functional antagonist comprises 1- aminocyclopropanecarboxylic acid, and pharmaceutically acceptable esters, amides, and salts thereof.
  • the functional antagonist comprises 1- aminocyclopropanecarboxylie acid.
  • esters of ACPC can be prepared by Fischer esterification of the parent carboxylic acid.
  • compounds wherein "X" is a lower alkylamino or lower dialkylamino moiety can be easily prepared by reacting ACPC with lower alkyl halides.
  • the functional antagonist comprises 1- aminocyclopropanecarboxylic acid.
  • the compound which possesses functional antagonistic properties at the NMDA receptor complex through a specific action at the associated strychnine-insensitive glycine site will comprise a compound having the formula:
  • B is -C0 2 H, or a pharmaceutically acceptable ester, amide, or salt thereof
  • R is -OH, or a pharmaceutically acceptable ester, ether or salt thereof, and its pharmaceutically acceptable acid addition salt thereof.
  • the functional antagonist comprises 7-chlorokynurenic acid, and pharmaceutically acceptable esters, amides, salts, ethers, and acid addition salts thereof.
  • a method to improve or enhance memory whereby a therapeutically-effective amount of a compound which possesses functional antagonist properties at the NMDA receptor complex through a specific action at the associated strychnine-insensitive glycine site is administered to a patient.
  • the methods of the present invention also can be used to treat a cognitive deficit consequent to many memory-related neurological disorders, whereby a therapeutically-effective amount of a compound having functional antagonist properties at the NMDA receptor complex through a specific action at the associated strychnine- insensitive glycine site is administered to a patient.
  • Such disorders can be the result of chronic neuronal degeneration or can be the result of acute brain injury.
  • epilepsy or seizures
  • hypoxia either alone (e.g., carbon monoxide poisoning, near drowning) or combined with ischemic blood flow reduction (e.g., cardiac arrest, stroke)
  • anxiety e.g., affective disorders
  • neurodegenerative diseases e.g., Guam ALS, Parkinson disease, Alzheimer disease, dementia and lathyrism
  • the methods of the present invention can also be employed in the treatment of memory impairment following acute brain injury, such as head trauma or multi-infarct dementia.
  • the formulations of the present invention comprise at least one compound of this invention in a therapeutically- or pharmaceutically-effective dose together with one or more pharmaceutically or tnerapeutically acceptable carriers and optionally other therapeutic ingredients.
  • a pharmaceutical formulation comprise at least one compound of this invention in a therapeutically- or pharmaceutically-effective dose together with one or more pharmaceutically or tnerapeutically acceptable carriers and optionally other therapeutic ingredients.
  • Various considerations are described, e.g., in Gilman et al. (eds) (1990) Goodman and Gilman's: The Pharmacological Bases of Therapeutics. 8th Ed. , Pergamon Press; and Remington's Pharmaceutical Sciences. Mack Publishing Co.: Easton, PA, 17th Ed. (1985) .
  • compositions for administration are discussed therein, e.g., for oral, intravenous, intraperitoneal, or intramuscular administration, and others.
  • Pharmaceutically acceptable carriers will include water, saline, buffers, and other compounds described, e.g., in the Merck Index, Merck & Co. , Rahway, NJ.
  • the pharmaceutical compositions will be administered by parenteral or oral administration for therapeutic treatment.
  • the pharmaceutical compositions can be administered in a variety of unit dosage forms depending upon the method of administration.
  • unit dosage forms suitable for oral administration include powder, tablets, pills, capsules and dragees.
  • compositions for intravenous administration which comprise a solution of the compound dissolved or suspended in an acceptable carrier, preferably an aqueous carrier.
  • an acceptable carrier preferably an aqueous carrier.
  • aqueous carriers can be used, e.g., water, buffered water, 0.9% saline, and the like.
  • These compositions will sometimes be sterilized by conventional, well known sterilization techniques, or can be sterile filtered.
  • the resulting aqueous solutions can be packaged for use as is, or lyophilized, the lyophilized preparation being combined with a sterile aqueous solution prior to administration.
  • compositions can contain pharmaceutically acceptable auxiliary substances as required to approximate physiological conditions, such as pH adjusting and buffering agents, tonicity adjusting agents, wetting agents and the like, for example, sodium acetate, sodium lactate, sodium chloride, potassium chloride, calcium chloride, sorbitan monolaurate, triethanolamine oleate, and the like.
  • auxiliary substances such as pH adjusting and buffering agents, tonicity adjusting agents, wetting agents and the like, for example, sodium acetate, sodium lactate, sodium chloride, potassium chloride, calcium chloride, sorbitan monolaurate, triethanolamine oleate, and the like.
  • nontoxic solid carriers can be used which include, for example, pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharin, talcum, cellulose, glucose, sucrose, magnesium carbonate, and the like.
  • a pharmaceutically acceptable nontoxic composition is formed by incorporating any of the normally employed excipients, such as those carriers previously listed, and generally 0.1-95% of active ingredient, preferably about 20%.
  • compositions are administered to a patient in an amount sufficient to at least partially improve cognition or enhance memory.
  • An amount adequate to accomplish this is defined as "therapeutically- effective amount or dose.” Amounts effective for this use will depend on the improvement desired and the weight and general state of the patient.
  • Compounds will preferably be administered in a daily dose.
  • the daily dose will vary with the nature of the active ingredient. For example, generally, ACPC will be administered in a range from about 100 mg to about 1000 mg per kilogram of body weight per day, whereas 7KYN will be administered in a range from about 1 mg to about 100 mg per kilogram of body weight per day.
  • a more preferred dosage of ACPC will range from about 200 mg to about 800 mg per kilogram of body weight and most preferred is a dosage of about 400 mg per kilogram of body weight per day.
  • a more preferred dosage of 7KYN will range from about 10 mg to about 50 mg per kilogram of body weight and most preferred is a dosage of about 30 mg per kilogram of body weight per day.
  • the dosages for other f nctional antagonist will generally be in a range of about 0.1 mg to about 1000 mg per kilogram of body weight per day.
  • a suitable dose can be administered in multiple sub- doses per day. These sub-doses can be administered in unit dosage forms. Typically, a dose or sub-dose can contain from about 1 mg to about 500 mg of active compound per unit dosage form. A more preferred dosage will contain from about 10 mg to about 100 mg of active compound per unit dosage form.
  • Cerebellar Granule Cell Cultures Primary cultures of cerebellar granule cells were prepared from 6 - 8 day old Sprague-Dawley rat pups using the method of Gallo et al . (1982) Proc. Natl. Acad. Sci. USA 29.-7919-7923. Dissociated cells were plated on poly-L-lysine coated 35 millimiter (mm) plates at a density of 2.2 - 3.8 x 10 5 cells/square centimeter (cm 2 ) .
  • Cultures were grown in Eagle's Basal Media containing 10% fetal calf serum, 2 millimolar (mM) L-glutamine, 0.1 milligram/milliliter (mg/ml) gentamicin, and 25 mM potassium chloride (KC1) . Others agents wre added as indicated without a change in culture media. Cytosine arabinoside (10 micromolar ( ⁇ M) ) was added 18 to 24 hours after plating to inhibit the growth of non-neuronal cells. Cultures prepared by this method were >90% enriched in granule neurons.
  • the total preincubation time in modified Locke's buffer was 40 minutes, which was previously established as a sufficient period of time to render cultured cerebellar granule neurons susceptible to L-glutamate toxicity (see Lysko et al . (1989) Brain Research 499:258-266).
  • Neurotoxicity was induced by a thirty minute incubation with L-glutamateLy at 37°C. The cultures were washed twice with 1.5 ml aliquots of Hank's Balanced Salt Solution at the end of this incubation period. One ml of conditioned media was added to the cultures, and the cultures were returned to the incubator. In experiments examining the potential neuroprotective effects of prolonged exposure to glycinergic ligands, cultures were incubated for 20-24 hours with various agents (final concentration, 1000 ⁇ M) prior to the washing, preincubation, and glutamate neurotoxicity protocol.
  • mice (Harlan Sprague-Dawley, Inc. , Frederick, MD) weighing 20-25 grams (g) were housed ten per cage (25 x 50 x 15 centimeters (cm) ) with food and water freely available. They were kept in a regulated environment for at least one week before they were used, lights on from 0600 to 1800 hours at a room temperature of 22-25°C with a relative humidity of 50% ⁇ 10%. Apparatus and Procedure
  • the apparatus was similar to that described by Weiskrantz and Mondadori (1991) Psychopharmacology 105:145-150 and by Baratti et al . (1984) Behav. Neural Biol. 0:155-169 with slight modifications.
  • the apparatus consisted of a platform made of white lucite (5 x 5 cm) , illuminated with a 25 Watt (W) bulb positioned 15 cm directly above. The platform was located 11.5 cm high on the outside of one wall of a black plastic box (12 x 12 x 30.5 cm).
  • a small triangular opening (3.5 x 3.5 x 3.5 cm) in the wall with a sliding door provided access from the platform to the dark interior of the box which contained a metallic grid floor at platform level and a removable lid (19 cm above the grid floor) .
  • the grid floor was connected to a scrambler shock generator (Letica, Barcelona, Spain) .
  • Each mouse was placed on the white lighted platform and the time spent to enter the dark compartment (step-through) latency was measured. When the mouse stepped into the dark compartment with its four paws, the hole was closed with the sliding door and a one second foot-shock was administered. Different footshock intensities (ranging from 0.25 to 0.625 mA) were used according to the experimental design. For retention tests, which took place at different periods after training, each mouse was placed on the lighted platform again and individual step-through latencies were recorded (cut off time 300 seconds) .
  • hypoxia chambers were 400 ml glass beakers (12.5 cm x 7.5 cm) covered with a rubber stopper and continuously perfused with a gas mixture consisting of 7% oxygen and 93% nitrogen or other inert gases. The flow rate was adjusted such that the gas turnover in each chamber was one liter per minute. Oxygen concentration was continuously monitored in one of the hypoxia chambers with an oxygen sensor (Oxymetre Hospitalier, Bioblock Sci., Cedex, France) .
  • Drugs Mice were injected intraperitoneally (0.1 - 0.2 ml) with either vehicle or drugs.
  • the following drugs were used: 1-aminocyclopropanecarboxylic acid (ACPC, Tocris Neuramin, Essex, UK) ; 7-chlorokynurenic acid (7KYN, Tocris Neuramin, Essex, UK) ; diazepam (DZP, Prodesfarma, Barcelona, Spain) ; pentylenetetrazol (PTZ, Sigma, St.
  • AP7, 7KYN, and 5,7DKYN were dissolved in 1.0 normal (N) aqueous sodium hydroxide (5-8% of volume) and then saline added to volume.
  • DZP and FG7142 were suspended in diluted Tween 80 (polyoxyethylene (20) sorbitan monooleate, Aldrich Chemical Company, Inc., Milwaukee, WI) .
  • ACPC and 7KYN facilitate recall of a passive avoidance (i.e., an inhibitory avoidance) task in mice.
  • These compounds also antagonize memory deficits in this task that are produced by pentylenetetrazol, a drug with known amnesic properties, and improve memory deficits induced by hypoxia.
  • Figure 1 shows the effect of pre- training administration of ACPC, 7KYN, DCS, 57DKYN, or FG7142 on passive avoidance acquisition-retention 24 hours after training in mice.
  • the drugs were given prior to training, while testing occurred 24 hours after training.
  • Administration of either ACPC, 7KYN, DCS, 57DKYN, or FG7142 resulted in significantly increased step-through latencies as compared to the control (saline) (SAL) group.
  • SAL control
  • compounds possessing functional antagonist properties at the NMDA receptor complex through a specific action at the associated strychnine- insensitive glycine site like ACPC, 7KYN, and 5-7KYN, facilitate learning and memory of an inhibitory avoidance task.
  • the facilitatory effect of these compounds was similar to that observed with D-cycloserine, a positive NMDA modulator at the strychnine-insensitive glycine site, aro with FG7142, a benzodiazepine receptor inverse agonist.
  • the antagonism by glycine of the 1- aminocyclopropanecarboxylic acid (ACPC) induced facilitation of acquisition-retention is shown in Figure 2.
  • Glycine GLY, 1 gram/kilogram (g/kg)
  • ACPC 400 milligrams/kilogram (mg/kg)
  • Training was performed with a 0.25 mA shock. Testing was 24 hours after training.
  • the ability of glycine to antagonize the facilitatory effects of ACPC in this measure clearly demonstrates that the cognitive enhancing properties of ACPC result from its action at the strychnine-insensitive glycine site as a functional NMDA receptor antagonist.
  • FIG 3 is a graphical representation showing that ACPC and 7-chlorokynurenic acid (7KYN) protect against passive avoidance retention deficits induced by pentylenetetrazol (PTZ) .
  • ACPC 400 mg/kg
  • 7KYN (30 mg/kg) were administered i.p. 30 minutes before training.
  • a convulsant dose of PTZ 45 mg/kg
  • PTZ 45 mg/kg
  • PTZ produced convulsions in all animals.
  • NMDA receptor complex ligands and DZP The effects of NMDA receptor complex ligands and DZP on passive avoidance acquisition-retention are shown in Figure 4. All drugs were administered i.p. 30 minutes before training. Administration of ACPC, 7KYN, and DCS gave results comparable to that of the control group. Administration of AP7, MK-801, or DZP resulted in significantly decreased step- through latencies when compared to the control group. These data demonstrate that the competitive NMDA antagonist AP-7 and the use dependent channel blocker, MK-801, interfere with passive avoidance acquisition-retention. A similar effect is observed with diazepam, a benzodiazepine with well-described amnesic properties. These data demonstrate that, in contrast to compounds binding at the strychnine-insensitive receptor, NMDA antagonists acting at other recognition sites of the NMDA receptor complex possess amnesic properties.
  • Figure 5 is a graphical representation showing the effects of NMDA receptor complex ligands and FG7142 on retention of a passive avoidance task 30 minutes and 24 hours after training. All compounds were administered i.p. immediately after training. FG7142 resulted in a statistically different step-through latency at 30 minutes when compared to the control group. Administration of ACPC, 7KYN, and DCS produced statistically significant differences in step through latencies 24 hours after training when compared to the control group. Thus, functional NMDA antagonists at the strychnine- insensitive glycine site facilitate retention of an inhibitory avoidance task also when administered post-training.

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Abstract

L'invention concerne l'utilisation d'un composé présentant des propriétés antagonistes fonctionnelles vis-à-vis du complexe du récepteur de NMDA, grâce à une action spécifique au niveau du site glycine associé insensible à la strychnine, pour améliorer la cognition chez des êtres humains normaux et pour traiter les déficits cognitifs résultant d'une dégénérescence nerveuse chronique, d'une lésion cérébrale aiguë, de l'hypoxy ou d'autres troubles neurologiques. En particulier, les composés présentant ces propriétés antagonistes fonctionnelles comprennent l'acide 1-aminocyclopropanecarboxylique, et ses esters, sels et sels d'addition d'acide pharmaceutiquement acceptables, et l'acide 7-chlorokynurénique, et ses esters, amides, sels, éthers et sels d'addition d'acide pharmaceutiquement acceptables.
EP94906547A 1993-01-11 1994-01-07 Procedes d'amelioration de la cognition au moyen d'agonistes partiels du complexe glycine/recepteur de nmda Expired - Lifetime EP0678021B1 (fr)

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US08/003,225 US5428069A (en) 1993-01-11 1993-01-11 Treating cognition with, aminocyclopropanecarboxylic derivatives
PCT/US1994/000235 WO1994015598A2 (fr) 1993-01-11 1994-01-07 Procedes d'amelioration de la cognition au moyen d'antagonistes fonctionnels du complexe glycine/recepteur de nmda

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KR102676099B1 (ko) * 2023-10-06 2024-06-18 인하대학교 산학협력단 적응형 흙막이 벽체 변위 분석 시스템 및 방법

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5854217A (en) 1992-09-28 1998-12-29 Bearsden Bio, Inc. Allosteric modulators of the NMDA receptor and their use in the treatment of CNS disorders and enhancement of CNS function
GB9311948D0 (en) * 1993-06-10 1993-07-28 Zeneca Ltd Substituted nitrogen heterocycles
US5801168A (en) * 1994-06-09 1998-09-01 Zeneca Limited Substituted nitrogen heterocycles
ATE320804T1 (de) * 1995-12-07 2006-04-15 Daniel C Javitt Behandlung negativer und kognitiver symptome der schizophrenie mit antagonisten der glycinaufnahme
US6361957B1 (en) * 1999-08-03 2002-03-26 Glytech, Inc. Assay for D-serine transport antagonist and use for treating psychosis
US6355681B2 (en) * 1995-12-07 2002-03-12 Glytech, Inc. Glycine substitutes and precursors for treating a psychosis
US5763393A (en) * 1996-05-17 1998-06-09 Neurotherapeutics L.P. Neuroactive peptides
US6277825B1 (en) 1996-07-22 2001-08-21 University Of Utah Research Foundation Use of conantokins for treating pain
WO1998003189A1 (fr) 1996-07-22 1998-01-29 Cognetix, Inc. Utilisation de conantokines
CA2261568A1 (fr) 1996-07-22 1998-01-29 University Of Utah Research Foundation Conantokines
US5906976A (en) * 1996-10-22 1999-05-25 Ramot-University Authority For Applied Research And Industrial Development, Ltd. Method and composition for treating neuronal degeneration
US6399574B1 (en) 2000-03-22 2002-06-04 University Of Utah Research Foundation Use of conantokins
US7846913B2 (en) 2003-12-29 2010-12-07 Mcdevitt Jason Patrick Compositions and methods to treat recurrent medical conditions
JP2004530666A (ja) * 2001-03-29 2004-10-07 エモリー　ユニバーシティ 学習または条件付けのエンハンサーを用いる精神療法の急性薬理学的増強
US20030022253A1 (en) * 2001-07-25 2003-01-30 Nyxis Neurotherapies, Inc. Method for identifying, isolating and producing neuroactive binding agents and binding agents derived thereby
US20060084659A1 (en) * 2004-10-19 2006-04-20 Michael Davis Augmentation of psychotherapy with cannabinoid reuptake inhibitors
JP2006213611A (ja) * 2005-02-02 2006-08-17 Suzuka Univ Of Medical Science １‐アミノシクロプロパンカルボン酸等を主成分とする脳卒中又は脳卒中後遺症の予防用又は治療用薬剤
TW200820963A (en) * 2006-07-28 2008-05-16 Xenoport Inc Acyloxyalkyl carbamate prodrugs of α-amino acids, methods of synthesis and use
WO2014093277A1 (fr) 2012-12-11 2014-06-19 The Mclean Hospital Corporation Traitement de xénon et/ou d'argon comme complément de psychothérapie pour troubles psychiatriques

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4554017A (en) * 1978-06-03 1985-11-19 Bayer Aktiengesellschaft Method and compositions for regulating plant growth using cycloalkane-carboxylic acid compounds
US4788332A (en) * 1987-08-05 1988-11-29 General Foods Corporation L-aminodicarboxylic acid esters
US4781927A (en) * 1985-04-15 1988-11-01 General Foods Corporation Sweetening with l-aminodicarboxylic acid esters
US4822653A (en) * 1987-08-05 1989-04-18 National Starch And Chemical Corporation Recyclable hot melt adhesive compositions
US4904681A (en) * 1987-12-01 1990-02-27 G. D. Searle & Co. D-cycloserine and its prodrugs as cognitive enhancers
US6017957A (en) * 1989-08-08 2000-01-25 The United States Of America As Represented By The Department Of Health And Human Services Partial agonists of the strychnine insensitive glycine modulatory site of the N-methyl-D-aspartate receptor complex as neuropsychopharmacological agents
US5086072A (en) * 1990-06-18 1992-02-04 The United States Of America As Represented By The Department Of Health And Human Services Treatment of mood disorders with functional antagonists of the glycine/nmda receptor complex

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9415598A2 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102676099B1 (ko) * 2023-10-06 2024-06-18 인하대학교 산학협력단 적응형 흙막이 벽체 변위 분석 시스템 및 방법

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